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WEBENCH® Tools/UCC28700-Q1: TINA-TI simulation stuck at 5%

WILLIAM ZHU
Prodigy 20 points
Part Number: UCC28700-Q1
Other Parts Discussed in Thread: UCC28700, TINA-TI

Tool/software: WEBENCH® Design Tools

Hi the expert at TI,

When I try to do a circuit simulation with UCC28700 in TINA-TI, the simulation is always stucking at 5%. I spend more than 2 days on this but cannot find the reason. If there is anyone can help me on this, it will be great thanks. Please see attached test.tsc file.0118.Test.TSC

  • 0
    TI__Guru* 80756 points

    Hello,

    The tina schematic that you have attached does not contain the UCC28700 circuit.  Could you explain in greater detail what your issue is?

    Regards,

  • 0 in reply to Mike O'
    Prodigy 20 points

    Hi Mike,

    Really sorry for the mistake. Please see the following file.

    0310.Test.TSC

  • 0 in reply to WILLIAM ZHU
    TI__Guru* 80756 points

    Hello,

    I tried running transient and it does lock up at 5%.  I looked at your schematic and you are trying to use two inductor's instead of a fly back transformer.  More than likely your simulation is getting hung up because of this.  It is most likely a convergence issue.

    I would suggested re down loading the Tina transient model for the UCC28700.  This time instead of using inductors you can modify TX1's fly back transformer to match your specifications.

    Double click on TX1 hit the Enter Macro button.  About halfway down the page you can change the number of turns, primary resistance, magnetizing inductance.  There is even a typed schematic for the transformer.  Make the changes and save the Macro and then run you simulation again.

    Regards,